Which of the 12 apostles were martyred? {Martyrdom of the Apostles]

All except one. According to tradition, all of the twelve apostles died as martyrs during the first century A.D. Only St. John, the writer of the Gospel with his name and the Book of Revelation died a natural death. It is believed he died near the year 100 A.D.

The possible causes of death of each of the Twelve Apostles:

Andrew: Martyrdom by crucifixion (bound, not nailed, to a cross).1

Bartholomew (Often identified with Nathaniel in the New Testament): Martyrdom by being either 1. Beheaded, or 2. Flayed alive and crucified, head downward.1

James the Greater: Martyrdom by being beheaded1 or stabbed2 with a sword.

James the Lesser: Martyrdom by being thrown from a pinnacle of the Temple at Jerusalem , then stoned and beaten with clubs.2

John: Died of old age.1

Jude (Often identified with Thaddeus in the New Testament): Martyrdom by being beaten to death with a club.2